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Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
I have an R data frame containing a factor that I want to "expand" so that for each factor level, there is an associated column in a new data frame, which contains a 1/0 indicator. E.g., suppose I have:
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How can I match a string with a regex in Bash?
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To match regexes you need to use the =~ operator.
Try this:
[[ sed-4.2.2.tar.bz2 =~ tar.bz2$ ]] && echo matched
Alternatively, you can use wildcards (instead of regexes) with the == operator:
[[ sed-4.2.2.tar.bz2 == *tar.bz2 ...
A weighted version of random.choice
...red Oct 4 '14 at 18:56
Ronan PaixãoRonan Paixão
5,72911 gold badge2323 silver badges2121 bronze badges
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Getting the name of a child class in the parent class (static context)
...ng an ORM library with reuse and simplicity in mind; everything goes fine except that I got stuck by a stupid inheritance limitation. Please consider the code below:
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Python JSON serialize a Decimal object
...object, and wish to encode this to a JSON string which should look like {'x': 3.9} . I don't care about precision on the client side, so a float is fine.
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LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
...rst but once you get acquainted with the way the SQL is composed from the expressions it will make a lot more sense, under the covers this will generate the type of join you are looking for.
EDIT Adding example for second join based on comment.
var query =
from t1 in myTABLE1List // List<TA...
How to get a JavaScript object's class?
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There's no exact counterpart to Java's getClass() in JavaScript. Mostly that's due to JavaScript being a prototype-based language, as opposed to Java being a class-based one.
Depending on what you need getClass() for, there are several ...
How can I open the interactive matplotlib window in IPython notebook?
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In [2]: %matplotlib inline
In [3]: plot(...)
In [4]: %matplotlib qt # wx, gtk, osx, tk, empty uses default
In [5]: plot(...)
and that will pop up a regular plot window (a restart on the notebook may be necessary).
I hope this helps.
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Getting number of elements in an iterator in Python
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No. It's not possible.
Example:
import random
def gen(n):
for i in xrange(n):
if random.randint(0, 1) == 0:
yield i
iterator = gen(10)
Length of iterator is unknown until you iterate through it.
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How to convert from System.Enum to base integer?
... inheritance relationship with Int32 (though both are ValueTypes), so the explicit cast cannot be correct within the type system
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